Question

1. Give the coordinates of two points on the line x = 5.
2. Give the coordinates of two points on the line y = -2.
3. Write the equation of the horizontal line passing through the point (-1, -8).
4. Write the equation of the vertical line passing through the point (3, 1).
5. Is the line with equation x = 4 horizontal or vertical? What is the slope of this line?
6. Is the line with equation y = -8 horizontal or vertical? What is the slope of this line?
For 1 I answered: (5, -6) and (5, 9)
And for 2 I answered: (7, -2) and (10, -2)

Answer 1

1 is correct

Answer 2

as well as 2

Answer 3

Great! =D
The really important thing to understand is that a horizontal line has lots and lots of different x values, but ALL points will have the same y value. So we write them as y=

And a vertical line has lots and lots of different y values, but ALL points will have the save x value. So we write them as x =